I've just registered for these forums and I've noticed that our email provider (Google) is rejecting the notification emails:
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Mar 16, 2020, 11:55 0.06 seconds Rejected Received from an SMTP server with IP address: 18.104.22.168
I also notice that there is no PTR record for the IP address, apart from the default Amazon AWS one.
Could these be the explanation for the rejection?
I searched the forums assuming this would be affecting many people, but I can't find any threads.